基于MFC的地铁轨道振动能量收集研究

Metro track vibration energy collection based on PFC

压电陶瓷极限受拉承载力弱,导致传统悬臂型俘能器在工程应用中极易开裂损坏,与其持续供能的初衷相违背。压电纤维复合材料(MFC)具有优异的柔韧性、耐久性,恰恰弥补了这一缺陷。然而以MFC材料为基础的俘能器在地铁轨道振动能量俘获中的应用鲜有研究。首先建立地铁车辆-轨道耦合系统模型,得到钢轨在车辆荷载作用下的动力响应。紧接着基于混合规则和代表体积元建立型悬臂式MFC俘能器的力电耦合模型,并将钢轨的动力响应作为俘能器的输入荷载预测其电能输出,讨论了材料参数、几何参数及车辆荷载特性对输出电能的影响。并进一步通过试验研究,验证了所建立理论分析模型的正确性。最后基于LTC3588-1能量管理芯片进行了能量收集-存储模拟,验证了MFC俘能器用于无线传感器供能的可行性。

Due to weak ultimate tensile-bearing capacity of piezoelectric ceramics,the traditional cantilever energy collector is easy to crack and damage in engineering application,it is contrary to its original intention of continuous energy supply.Piezoelectric fiber composite(PFC)has excellent flexibility and durability to just make up for this defect.However,there is little study on application of energy collector based on PFC material in metro track vibration energy capture.Here,firstly,the metro vehicle-track coupled system model was established to obtain dynamic response of rail under vehicle load.Then,the mechanical-electric coupled model for d;type cantilever PFC energy collector was established based on hybrid rules and representative volume elements,and the dynamic response of rail was taken as the energy collector’s input load to predict its electric energy output.Effects of material parameters,geometric parameters and vehicle load characteristics on the output electric energy were discussed.Tests were conducted to verify the correctness of the theoretical analysis model.Finally,the energy collection-storage simulation was performed based on LTC3588-1 energy management chip to verify the feasibility of PFC energy collector for wireless sensor power supply.